STM32-Arduino
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Set c compile flags correctly
To support projects with C files.
Based on settings previous to commit 145219332a057558590256d33569acd8dc305a94 with extra -mthumb setting to match C++ compile flags.
With this change to platform.txt file replacing the version at C:\Users\Username\AppData\Local\Arduino15\packages\RedBear\hardware\STM32F2\0.3.1\platform.txt projects containg C files can once again be linked and downloaded successfully to the target device.
Fixes Issue #21